An anti-cracking and durable long-life asphalt pavement structure and its construction method

Abstract

The present invention discloses a crack-resistant and durable long-life asphalt pavement structure and its construction method, which relates to the technical field of asphalt pavement construction. It includes an asphalt surface layer, a reinforcement mesh, positioning piles, and fixing rings. A geotextile stress absorption layer is provided under the asphalt surface layer, and a prime coat is provided under the geotextile stress absorption layer. The prime coat is SBS modified emulsified asphalt. By using polypropylene geotextiles to reinforce the pavement structure and form a composite structure with road materials, it has strong interfacial effects and reinforcement functions, forms a good whole with the surface layer and the base layer, effectively prevents or delays the cracking of asphalt pavements, improves the service life of the asphalt surface layer. After the polypropylene geotextiles are combined with the prime coat oil, it has excellent waterproof effects, prevents surface water from seeping into the pavement structure and eroding the roadbed, and extends the service life of the pavement.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt pavement construction, and specifically relates to a crack-resistant and durable long-life asphalt pavement structure and a construction method thereof. Background Technique

[0002] An asphalt pavement refers to various types of pavements paved by mixing road-use asphalt materials in mineral materials. After retrieval, a patent with the authorization number CN218203658U in China discloses a durable asphalt pavement structure. The pavement structure pours two pavement edge slopes on the top of the cement pouring layer, and then covers the asphalt layer on the upper surface of the cement pouring layer. At this time, the edge part of the asphalt layer is embedded inside the pavement edge slope, which can protect the asphalt edge and reduce the probability of damage to the asphalt layer edge, effectively improving the durability of the asphalt pavement structure. However, when the temperature drops too fast and too much in winter, the temperature stress in the asphalt surface layer cannot be relieved in time, and the relaxation performance cannot be fully exerted, resulting in shrinkage cracks. In summer, when rain is frequent, the accumulated water on the road surface and the accumulated water from the melting of winter snow will seep into the pavement structure, erode the roadbed, and cause early damage and water damage to the pavement. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides a crack-resistant and durable long-life asphalt pavement structure and a construction method thereof, which solve the problems in the background technique that when the temperature drops too fast and too much in winter, the temperature stress in the asphalt surface layer cannot be relieved in time, the relaxation performance cannot be fully exerted, resulting in shrinkage cracks, and in summer, when rain is frequent, the accumulated water on the road surface and the accumulated water from the melting of winter snow will seep into the pavement structure, erode the roadbed, and cause early damage and water damage to the pavement.

[0004] To achieve the above objectives, the present invention is realized through the following technical solutions: A crack-resistant and durable long-life asphalt pavement structure and a construction method thereof, including an asphalt surface layer, a strengthening mesh, positioning piles, and fixing rings. A geotextile stress absorption layer is provided under the asphalt surface layer, a penetrating layer is provided under the geotextile stress absorption layer, the penetrating layer is SBS modified emulsified asphalt, a base layer is provided under the penetrating layer, the base layer is a semi-rigid base layer, a strengthening mesh is provided inside the asphalt surface layer, positioning piles are provided at the bottom of the strengthening mesh, and fixing rings are provided at the top of the positioning piles.

[0005] Preferably, the strengthening mesh is woven by criss-crossed steel wires, and the cross intersections where the steel wires on the surface of the strengthening mesh are connected are snap-fitted with the tops of the positioning piles. Grooves are provided at the tops of the positioning piles, and the outer sides of the tops of the positioning piles are in a threaded structure. The outer sides of the tops of the positioning piles are threadedly connected with the inner sides of the fixing rings.

[0006] Preferably, the bottom cross-section of the positioning pile is in a cross shape, and the positioning pile is arranged inside the asphalt surface layer and the geotextile stress absorption layer.

[0007] Preferably, steel fibers are provided inside the geotextile stress absorption layer, and the surface of the steel fibers is in a spiral structure.

[0008] Preferably, the geotextile stress absorption layer is a geotextile made of polypropylene fibers.

[0009] Preferably, the steps are as follows:

[0010] S1: Prepare raw materials, strictly control the selection of asphalt materials. The selection of asphalt is very crucial. Asphalt that meets the specification requirements should be selected. In particular, the penetration, ductility, softening point, and flash point indicators of asphalt must be strictly controlled. Tests should be carried out for each batch of asphalt when it enters the site. In addition, the prime coat and the prime coat asphalt should use the same kind of asphalt as that used for the asphalt concrete.

[0011] S2: Prepare asphalt mixture. When preparing, excellent materials should be selected, and steel fibers should be added and stirred according to the ratio. The mixed materials should be tested to ensure reliable quality.

[0012] S3: Subgrade treatment: Clean the surface of the subgrade, fill the holes and cracks to ensure the stability and strength of the subgrade. Before paving the subgrade, strict inspection and acceptance of the subbase should be carried out. In particular, the inspection frequency should be increased for the acceptance of the roadbed, with one section every 5m and 3 points for each section. The acceptance content includes flatness, longitudinal elevation, midline deviation, width, cross slope, compaction degree, etc. After ensuring that the subbase is qualified, the surface of the subbase should be thoroughly cleaned.

[0013] S4: Set out and support the side formwork. Use a total station to control the center line and side line of the whole section, with one pile position every 10m. Nail the corresponding side piles to control the width of the paved road surface. The side formwork uses 18cm channel steel, and a triangular steel frame is used to fix the formwork. The installation side line of the formwork is consistent with the designed width, and the support is firm to avoid the formwork running during rolling at the edge.

[0014] S5: Prepare the prime coat. Select a suitable prime coat and its dosage. To ensure the adhesion between the geotextile for asphalt pavement and the road surface, there must be sufficient prime coat to make it fully absorb asphalt. If the dosage of the prime coat is insufficient, it will cause insufficient adhesion between the geotextile and the road surface. Avoid excessive prime coat causing asphalt exudation and geotextile slippage. The asphalt absorption of the geotextile for asphalt pavement is 0.95L / ㎡, and the spraying width of the asphalt coating should be 40 - 100mm wider than the geotextile.

[0015] S6: Laying of geotextile. The polypropylene needle-punched geotextile should be laid immediately after spraying the prime coat. Fix the geotextile at one end with iron nails or wooden wedges. Then lay the geotextile flat and compact and flatten it with light tools. Next, install the reinforcement mesh between the asphalt surface course and the semi-rigid base course and fix it by inserting positioning piles into the base course.

[0016] S7: Asphalt paving. Before asphalt paving, the paver should be preheated 1 hour in advance. Paving can be carried out when the temperature reaches 100°C. Pave along the set-out line. During paving, pay attention to uniform and complete paving. For areas that cannot be paved, replenish the material in time. Do not spread the material randomly. After paving, compact it with a steel-wheel roller. The initial compaction temperature is 135°C, and the final compaction temperature is not lower than 90°C. For areas that cannot be rolled, use a rammer to roll and compact.

[0017] S8: Maintenance. The hot mix asphalt mixture surface course must be fully compacted. It can only be opened to traffic after the paving layer has completely cooled naturally and the surface temperature of the mixture is lower than 5°C. In the initial stage of opening to traffic, the vehicle speed should be controlled not to exceed 20 km / h until the road surface is fully formed.

[0018] Preferably, in S7, in order to make the asphalt surface course and the non-asphalt material base course combine well, a thin layer that penetrates a certain depth into the surface of the base course is formed by spraying modified emulsified asphalt on the base course.

[0019] Preferably, the paving sequence of the asphalt mixture should be gradually retreated from far to near in the feeding direction and should be paved on the entire road surface as much as possible to avoid longitudinal joints. If the road surface is too wide to be paved in full width, it can be divided into two or several widths according to the lane width and paved separately, but the joints must be parallel to the road center line, and the longitudinal joints should overlap closely to avoid grooves.

[0020] Preferably, the transverse joint should be perpendicular to the road center line. When joining, first cover the planed joint edge with hot mix asphalt mixture, with a covering thickness of 15 cm. After the asphalt mixture at the joint becomes soft, remove the covered mixture, replace it with new hot mixture for paving, then ram along the joint edge with heat immediately, and level the hot material at the joint. Then, while it is hot, roll and compact tightly along the joint edge with a roller.

[0021] The present invention provides an anti-cracking, durable and long-life asphalt pavement structure and its construction method. It has the following beneficial effects:

[0022] (1) A crack-resistant, durable, and long-life asphalt pavement structure and its construction method, wherein the pavement structure is reinforced with polypropylene geotextile to form a composite structure with road materials, and the pavement is provided with a strong interface effect and reinforcement effect by cooperating with a reinforcing mesh, thereby forming a good whole with the surface layer and the base layer, effectively preventing or delaying the cracking of the asphalt pavement and improving the service life of the asphalt surface layer. The polypropylene geotextile and the penetrating oil have an excellent waterproof effect after being combined, preventing surface water from penetrating into the pavement structure and eroding the roadbed, thereby extending the service life of the pavement;

[0023] (2) Polypropylene geotextile has good freeze-thaw resistance. The physical and mechanical changes of tensile strength, elongation, bursting strength, etc. are small after repeated freeze-thaw cycles between -40°C and room temperature. In addition to being suitable for use on roads in normal temperature climates, it is also suitable for crack resistance in cold areas. Polypropylene has natural chemical stability. Except for concentrated sulfuric acid and concentrated nitric acid, polypropylene hardly reacts with other reagents. It is widely adapted to various soil environments, especially for use in saline-alkali soils, acidic stones, cement and other conditions with different acid and alkaline environments.

[0024] (3) This crack-resistant, durable, and long-life asphalt pavement structure and its construction method can effectively control the elasticity of the asphalt pavement by setting a reinforcing mesh and polypropylene geotextile. At the same time, fixing the reinforcing mesh by positioning piles can effectively prevent the reinforcing mesh from slipping inside the pavement. By adding an appropriate amount of steel fiber, the tensile strength and toughness of the asphalt pavement can be effectively improved, the occurrence of cracks can be reduced, and the durability and safety of the concrete can be improved.

[0025] This solves the problem that when the temperature drops too quickly and too much in winter, the temperature stress in the asphalt surface layer cannot be relieved in time, and the relaxation performance cannot be fully exerted, which will cause shrinkage cracks. In summer, there are frequent rains, road surface water, and water from melted snow in winter will penetrate into the pavement structure, erode the roadbed, and cause early damage and water damage to the road surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 Schematic diagram of the steel fiber structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the reinforcing net structure of the present invention;

[0029] Figure 4 This is a schematic diagram of the positioning pile and reinforcement net structure of the present invention;

[0030] Figure 5 This is a schematic diagram of the positioning pile structure of the present invention;

[0031] Figure 6 This is a schematic diagram of the fixing ring structure of the present invention;

[0032] Figure 7 This is a schematic diagram of the process of the present invention.

[0033] In the figure, 1 is the asphalt surface layer; 2 is the geotextile stress absorption layer; 3 is the prime coat; 4 is the reinforcement mesh; 5 is the positioning pile; 6 is the base course; 7 is the fixing ring; 8 is the steel fiber. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Embodiment 1:

[0036] A long-life crack-resistant and durable asphalt pavement structure includes an asphalt surface layer 1, a reinforcement mesh 4, a positioning pile 5, and a fixing ring 7. A geotextile stress absorption layer 2 is provided below the asphalt surface layer 1, a prime coat 3 is provided below the geotextile stress absorption layer 2, the prime coat 3 is SBS modified emulsified asphalt, a base course 6 is provided below the prime coat 3, the base course 6 is a semi-rigid base course, a reinforcement mesh 4 is provided inside the asphalt surface layer 1, a positioning pile 5 is provided at the bottom of the reinforcement mesh 4, and a fixing ring 7 is provided at the top of the positioning pile 5.

[0037] The reinforcement mesh 4 is woven by criss-crossed steel wires, and the cross intersections where the steel wires on the surface of the reinforcement mesh 4 are connected are snap-fitted with the top of the positioning pile 5. A groove is provided at the top of the positioning pile 5, and the outer side of the top of the positioning pile 5 has a threaded structure, and the outer side of the top of the positioning pile 5 is threadedly connected to the inner side of the fixing ring 7.

[0038] The bottom cross-section of the positioning pile 5 is in a cross shape, and the positioning pile 5 is provided inside the asphalt surface layer 1 and the geotextile stress absorption layer 2. The cross-shaped structure is beneficial to improving the friction with the base course, thereby improving the firmness of fixing the reinforcement mesh.

[0039] Steel fibers 8 are provided inside the geotextile stress absorption layer 2, and the surface of the steel fibers 8 has a spiral structure. The spiral outer wall is beneficial to improving the friction with the asphalt.

[0040] A geotextile made of polypropylene fibers is laid on the surface of the geotextile stress absorption layer 2.

[0041] Embodiment 2:

[0042] A crack-resistant and durable long-life asphalt pavement structure and its construction method are as follows:

[0043] S1: Prepare raw materials, and strictly control the selection of asphalt materials. The selection of asphalt is crucial. Asphalt that meets the specification requirements should be selected. In particular, the penetration, ductility, softening point, and flash point of asphalt must be strictly inspected. Tests should be carried out for each batch of asphalt upon arrival. In addition, the prime coat and the asphalt for the prime coat should use the same kind of asphalt as that used for the asphalt concrete;

[0044] S2: Prepare asphalt mixture. When preparing, excellent materials should be selected, and steel fibers should be added and stirred according to the ratio. The mixed materials should be inspected to ensure reliable quality;

[0045] S3: Subgrade treatment: Clean the surface of the subgrade, fill holes and cracks to ensure the stability and strength of the subgrade. Before paving the subgrade 6, strict inspection and acceptance of the underlying layer must be carried out. In particular, the inspection frequency should be increased for the acceptance of the roadbed. It should be carried out at 5m intervals for each section, with 3 points for each section. The contents of the acceptance include flatness, longitudinal elevation, midline deviation, width, cross slope, compaction degree, etc. After ensuring that the underlying layer is qualified, thoroughly clean the surface of the underlying layer;

[0046] S4: Set out and erect the side formwork. Use a total station to control the center line and side line of the whole section, with a pile position every 10m. Drive the corresponding side piles to control the width of the paved road surface. The side formwork uses 18cm channel steel, and a triangular steel frame is used to fix the formwork. The installation side line of the formwork is consistent with the design width, and the support is firm to avoid formwork displacement when compressing the edge;

[0047] S5: Prepare the prime coat. Select a suitable prime coat and its dosage. To ensure the adhesion between the geotextile for asphalt pavement and the road surface, sufficient prime coat is required to make it fully absorb asphalt. If the dosage of the prime coat is insufficient, it will cause insufficient adhesion between the geotextile and the road surface. Avoid excessive use of asphalt resulting in asphalt seepage and geotextile slippage. The asphalt absorption of the geotextile for asphalt pavement is 0.95L / ㎡, and the spraying width of the asphalt coating should be 40 - 100mm wider than the geotextile;

[0048] S6: Lay the geotextile. The polypropylene needle-punched geotextile should be laid immediately after spraying the prime coat. Fix the geotextile at one end with nails or wooden wedges; then lay the geotextile flat and compact and flatten it with a light tool. Then install a reinforcement mesh between the asphalt surface layer and the semi-rigid subgrade, and fix it by inserting positioning piles into the subgrade;

[0049] S7: Spread asphalt. Before spreading asphalt, the paver should be preheated 1 hour in advance. It can be spread when the temperature reaches 100 degrees. Spread along the set-out line. When spreading, pay attention to uniform spreading. For some places that cannot be spread, make up the materials in time and do not throw materials. After spreading, use a steel wheel roller to compact. The initial compaction temperature is 135 degrees, and the final compaction temperature is not lower than 90 degrees. If some places cannot be compacted, use a rammer to compact and tamp;

[0050] S8: Maintenance. For the surface course of hot mix asphalt mixture, it must be fully compacted. Traffic can only be opened after the paved layer has completely cooled naturally and the surface temperature of the mixture is lower than 50°C. In the initial stage of opening traffic, the vehicle speed should be controlled not to exceed 20 km / h until the road surface is completely formed.

[0051] In S7, in order to make the asphalt surface course combine well with the non-asphalt material base course, a thin layer that penetrates a certain depth into the surface of the base course is formed by spraying modified emulsified asphalt on the base course.

[0052] The paving sequence of the asphalt mixture should be gradually retreated from far to near in the feeding direction. It should be paved on the entire road surface as much as possible to avoid longitudinal joints. If the road surface is too wide to be paved in full width, it can be divided into two or several widths according to the lane width and paved separately, but the joints must be parallel to the road center line, and the longitudinal joints should be closely overlapped to avoid grooves.

[0053] The transverse joint should be perpendicular to the road center line. When jointing, first cover the planed joint edge with hot asphalt mixture, with a covering thickness of 15 cm. After the asphalt mixture at the joint becomes soft, remove the covered mixture, replace it with new hot mixture for paving, then ram it along the joint edge with heat immediately, and level the hot material at the joint. Then, while it is hot, roll it tightly along the joint edge with a roller.

[0054] The anti-cracking, durable and long-life asphalt pavement structure and its construction method adopt polypropylene geotextiles to reinforce the pavement structure and form a composite structure with road materials, which has strong interfacial effects and reinforcement functions, forms a good whole with the surface layer and the base layer, effectively prevents or delays the cracking of the asphalt pavement, and improves the service life of the asphalt surface layer. After the polypropylene geotextile is combined with the prime coat, it has excellent waterproof effects, prevents surface water from seeping into the pavement structure and eroding the subgrade, and extends the service life of the pavement. The polypropylene geotextile has good freeze-thaw resistance, and the physical and mechanical properties such as tensile strength, elongation rate, and bursting strength change little after repeated freeze-thaw cycles between -40°C and normal temperature. In addition to being suitable for pavement use in normal temperature climates, it is also applicable to anti-cracking of pavements in cold regions. It has natural chemical stability and hardly reacts with other reagents except concentrated sulfuric acid and concentrated nitric acid, and is widely applicable to various soil environments, especially in saline-alkali soil, acidic rock, cement and other environments with different acid-base conditions. By setting the reinforcement mesh and the polypropylene geotextile, the expansion and contraction of the asphalt pavement can be effectively controlled. At the same time, by fixing the reinforcement mesh with positioning piles, the slippage of the reinforcement mesh inside the pavement can be effectively prevented. By adding an appropriate amount of steel fibers, the tensile strength and toughness of the asphalt pavement can be effectively improved, the generation of cracks can be reduced, and the durability and safety of the concrete can be improved, thus solving the problems that when the temperature drops too fast and too much in winter, the temperature stress in the asphalt surface layer cannot be relieved in time, the relaxation performance cannot be fully exerted, and shrinkage cracks will occur, and in summer, when rain is frequent, the water accumulated on the road surface and the water accumulated from the melting of snow in winter will seep into the pavement structure and erode the subgrade, causing early damage and water damage to the pavement.

[0055] The components of the present invention, namely, 1. asphalt surface layer; 2. geotextile stress absorption layer; 3. prime coat; 4. reinforcement mesh; 5. positioning pile; 6. base layer; 7. fixing ring; 8. steel fiber, are all common standard components or components known to those skilled in the art, and their structures and principles can all be learned by those skilled in the art through technical manuals or by conventional experimental methods.

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0057] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative style of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An anti-cracking and durable long-life asphalt pavement structure, characterized in that: It includes an asphalt surface layer (1), a reinforcement mesh (4), positioning piles (5), and fixing rings (7). A geotextile stress absorption layer (2) is provided below the asphalt surface layer (1). A prime coat (3) is provided below the geotextile stress absorption layer (2). The prime coat (3) is SBS modified emulsified asphalt. A base course (6) is provided below the prime coat (3). The base course (6) is a semi-rigid base course. A reinforcement mesh (4) is provided inside the asphalt surface layer (1). Positioning piles (5) are provided at the bottom of the reinforcement mesh (4). Fixing rings (7) are provided at the tops of the positioning piles (5). The reinforcement mesh (4) is formed by weaving steel wires in a criss-cross pattern. The cross intersections where the steel wires on the surface of the reinforcement mesh (4) are connected are snap-fitted with the tops of the positioning piles (5). Grooves are provided at the tops of the positioning piles (5), and the outer sides of the tops of the positioning piles (5) are in a threaded structure. The outer sides of the tops of the positioning piles (5) are threadedly connected with the inner sides of the fixing rings (7). The bottom cross-section of the positioning pile (5) is in a cross shape, and the positioning pile (5) is provided inside the asphalt surface layer (1) and the geotextile stress absorption layer (2). Steel fibers (8) are provided inside the geotextile stress absorption layer (2), and the surfaces of the steel fibers (8) are in a spiral structure. The geotextile stress absorption layer (2) is a geotextile made of polypropylene fibers.

2. The construction method of an anti-cracking and durable long-life asphalt pavement structure according to claim 1, characterized in that: The steps are as follows: S1: Prepare raw materials. Strictly control the selection of asphalt materials. The selection of asphalt is very crucial. Asphalt that meets the specification requirements should be selected. In particular, the penetration, ductility, softening point, and flash point indexes of asphalt must be strictly controlled. Tests should be carried out for each batch of asphalt when it enters the site. In addition, the prime coat oil and the prime coat asphalt should use the same kind of asphalt as that used for the asphalt concrete. S2: Prepare asphalt mixture. When preparing, excellent materials should be selected, and steel fibers should be added and stirred according to the ratio. The mixed material should be tested to ensure reliable quality. S3: Base course treatment: Clean the surface of the base course, fill holes and cracks to ensure the stability and strength of the base course. Before paving the base course, strict inspection and acceptance must be carried out on the subbase. In particular, when accepting the roadbed, the inspection frequency should be increased. Check at a section every 5m, with 3 points at each section. The acceptance contents include flatness, longitudinal elevation, midline deviation, width, cross slope, compaction degree, etc. After ensuring that the subbase is qualified, thoroughly clean the surface of the subbase. S4: Set out and support the side formwork. Use a total station to control the center line and side line of the whole section. Set a pile position every 10m, and drive the corresponding side piles to control the width of the paved road surface. The side formwork uses 18cm channel steel, and use a triangular steel frame to fix the formwork. The installation side line of the formwork is consistent with the designed width, and the support is firm to avoid the formwork running during rolling at the edge. S5: Preparation of the asphalt bonding coating. Select a suitable asphalt bonding layer and its application amount. To ensure the adhesion between the geotextile for asphalt pavement and the road surface, there must be sufficient asphalt bonding layer to fully absorb asphalt. If there is insufficient asphalt in the asphalt bonding layer, it will cause insufficient adhesion between the geotextile and the road surface. Avoid excessive use of asphalt, which may cause asphalt seepage and geotextile slippage. The asphalt absorption amount of the geotextile for asphalt pavement is 0.95 L / ㎡, and the spraying width of the asphalt coating should be 40 - 100 mm wider than the geotextile. S6: Laying of the geotextile. The polypropylene needle-punched geotextile should be laid immediately after spraying the prime coat. Fix one end of the geotextile first, using iron nails or wooden wedges. Then lay the geotextile flat and compact and flatten it with light tools. Then install a reinforcement mesh between the asphalt surface layer and the semi-rigid base layer, and fix it by inserting positioning piles into the base layer. S7: Asphalt paving. Before asphalt paving, the paver should be preheated 1 hour in advance. It can be paved when the temperature reaches 100 degrees. Pave along the set-out line. During paving, pay attention to uniform and complete paving. For areas that cannot be paved, replenish materials in time. Do not throw materials. After paving, compact with a steel-wheel roller. The initial compaction temperature is 135 degrees, and the final compaction temperature is not lower than 90 degrees. If some areas cannot be compacted by the roller, use a rammer to compact and tamp. S8: Maintenance. The hot mix asphalt mixture surface layer must be fully compacted. It can be opened to traffic only after the paved layer has completely cooled naturally and the surface temperature of the mixture is lower than 50℃. In the initial stage of opening to traffic, the vehicle speed should be controlled not to exceed 20 km / h until the road surface is fully formed.

3. The construction method of an anti-cracking and durable long-life asphalt pavement structure according to claim 2, characterized in that: In S7, to make the asphalt surface layer combine well with the non-asphalt material base layer, a thin layer that penetrates a certain depth into the surface of the base layer is formed by spraying modified emulsified asphalt on the base layer.

4. The construction method of a crack-resistant and durable long-life asphalt pavement structure according to claim 2, characterized in that: asphalt The paving sequence of the mixture should be carried out gradually retreating from far to near in the feeding direction. It should be paved on the full-width road surface as much as possible to avoid longitudinal joints. If the road surface is too wide to be paved in full width, it can be divided into two or several sections according to the lane width and paved separately, but the joints must be parallel to the road center line, and the longitudinal joints should be closely overlapped to avoid grooves.

5. The construction method of an anti-cracking, durable and long-life asphalt pavement structure according to claim 2, characterized in that: The transverse joint should be perpendicular to the road center line. When jointing, first cover the planed joint edge with hot asphalt mixture, with a covering thickness of 15 cm. After the asphalt mixture at the joint softens, remove the covered mixture, replace it with new hot mixture for paving, then tamp along the joint edge with heat immediately, and level the hot material at the joint. Then roll it tightly along the joint edge with a roller while it is hot.

Images